Linux 6.18.51 / 7.2.5 for RISC-V

Raptor-compatible RISC-V Linux candidate

22 packages validated in QEMU: tiny/Buildroot firmware packages plus RV64 Alpine and Debian persistent disk packages.

All presets use HZ=100 and 1 GiB RAM. Tiny shell kernels use soft-float userspace; Buildroot kernels enable F/D for ilp32d/lp64d userspace. Alpine and Debian use RV64GC/lp64d userspace with official upstream repositories.

The build separates tiny and Buildroot kernel/firmware output, validates the embedded Image and DTB relocation at +63 MiB, and caches root filesystems by configuration. RV32 tiny shell uses time64 sleep/poll and waitid for child reaping.

Buildroot also provides an initialized fast shell at /sbin/raptor-shell, BusyBox nc, and tinysh-compatible fetch/run helpers. /proc/cpuinfo, sysfs, devtmpfs, devpts and command availability are tested in both full init and fast shell modes. Direct rdinit=/bin/sh bypasses initialization and is not a complete runtime environment.

Validation includes archive hashes, kernel configuration, userspace ELF ABI, two boot paths per tiny package and three per Buildroot package, tiny filesystem/sleep, ping and downloaded ELF execution checks, and 100 child processes plus a 90-second sleep for each Buildroot payload. Both distro packages are built cleanly inside full-system RV64 QEMU without host binfmt registrations. Their extracted test copies pass DNS/HTTPS, upstream jq installation/execution, key-based SSH, actual reboot and file/package/SSH-key persistence. See test-results.json and test-logs for the exact results. SHA256SUMS identifies the tested archives.

Preset	Architecture	Variant	Linux
qemu-rv32-fast	RV32	tiny_shell	6.18.51
qemu-rv32-fast	RV32	buildroot	6.18.51
qemu-rv32-latest	RV32	tiny_shell	7.2.5
qemu-rv32-latest	RV32	buildroot	7.2.5
qemu-rv32-m	RV32	tiny_shell	6.18.51
qemu-rv32-m	RV32	buildroot	6.18.51
qemu-rv32-s	RV32	tiny_shell	6.18.51
qemu-rv32-s	RV32	buildroot	6.18.51
qemu-rv32	RV32	tiny_shell	6.18.51
qemu-rv32	RV32	buildroot	6.18.51
qemu-rv64-alpine	RV64	alpine	6.18.51
qemu-rv64-debian	RV64	debian	6.18.51
qemu-rv64-fast	RV64	tiny_shell	6.18.51
qemu-rv64-fast	RV64	buildroot	6.18.51
qemu-rv64-latest	RV64	tiny_shell	7.2.5
qemu-rv64-latest	RV64	buildroot	7.2.5
qemu-rv64-m	RV64	tiny_shell	6.18.51
qemu-rv64-m	RV64	buildroot	6.18.51
qemu-rv64-s	RV64	tiny_shell	6.18.51
qemu-rv64-s	RV64	buildroot	6.18.51
qemu-rv64	RV64	tiny_shell	6.18.51
qemu-rv64	RV64	buildroot	6.18.51

These are QEMU-tested firmware/kernel/rootfs packages. FPGA acceptance has not been performed on this candidate. Board use requires the matching Raptor bitstream, stage0 and LiteX DTB with accurate XLEN, ISA (including F/D for Buildroot and distros), RAM, peripherals and timer frequency. Distro packages use a standalone kernel plus raw ext4 virtio disk, not a board SD-card layout or embedded payload. No board stage0 is included. Their unauthenticated serial root shell is for bring-up; SSH passwords are disabled. Service packages requiring OpenRC/systemd need explicit integration with BusyBox init.

Linux 6.18.50 / 7.2.3 for RISC-V

Raptor-compatible RISC-V Linux candidate

20 packages, each verified through separate Image/initramfs and embedded OpenSBI payload boot paths in QEMU.

All presets use HZ=100. Tiny shell kernels use soft-float userspace; Buildroot kernels enable F/D for ilp32d/lp64d userspace. Tiny fast presets use 64 MiB in QEMU; all Buildroot variants and other presets use 256 MiB.

The build separates tiny and Buildroot kernel/firmware output, validates the embedded Image and DTB relocation at +63 MiB, and caches root filesystems by configuration. RV32 tiny shell uses time64 sleep/poll and waitid for child reaping.

Buildroot also provides an initialized fast shell at /sbin/raptor-shell, BusyBox nc, and tinysh-compatible fetch/run helpers. /proc/cpuinfo, sysfs, devtmpfs, devpts and command availability are tested in both full init and fast shell modes. Direct rdinit=/bin/sh bypasses initialization and is not a complete runtime environment.

Validation includes archive hashes, kernel configuration, userspace ELF ABI, two boot paths per tiny package and three per Buildroot package, tiny filesystem/sleep, ping and downloaded ELF execution checks, and 100 child processes plus a 90-second sleep for each Buildroot payload. See test-results.json and test-logs for the exact results. SHA256SUMS identifies the tested archives.

Preset	Architecture	Variant	Linux
qemu-rv32-fast	RV32	tiny_shell	6.18.50
qemu-rv32-fast	RV32	buildroot	6.18.50
qemu-rv32-latest	RV32	tiny_shell	7.2.3
qemu-rv32-latest	RV32	buildroot	7.2.3
qemu-rv32-m	RV32	tiny_shell	6.18.50
qemu-rv32-m	RV32	buildroot	6.18.50
qemu-rv32-s	RV32	tiny_shell	6.18.50
qemu-rv32-s	RV32	buildroot	6.18.50
qemu-rv32	RV32	tiny_shell	6.18.50
qemu-rv32	RV32	buildroot	6.18.50
qemu-rv64-fast	RV64	tiny_shell	6.18.50
qemu-rv64-fast	RV64	buildroot	6.18.50
qemu-rv64-latest	RV64	tiny_shell	7.2.3
qemu-rv64-latest	RV64	buildroot	7.2.3
qemu-rv64-m	RV64	tiny_shell	6.18.50
qemu-rv64-m	RV64	buildroot	6.18.50
qemu-rv64-s	RV64	tiny_shell	6.18.50
qemu-rv64-s	RV64	buildroot	6.18.50
qemu-rv64	RV64	tiny_shell	6.18.50
qemu-rv64	RV64	buildroot	6.18.50

These are QEMU-tested firmware/kernel/rootfs packages. FPGA acceptance has not been performed on this candidate. Board use requires the matching Raptor bitstream, stage0 and LiteX DTB with accurate XLEN, ISA (including F/D for Buildroot), RAM, peripherals and timer frequency. No board stage0 or SD-card filesystem image is included.

Linux 6.18.20 for RISC-V

Pre-built Linux 6.18.20 kernels for RISC-V.

Minimal variants: rv32imac / rv64imac (FPU disabled).
Buildroot variants: rv32imafd / rv64imafd (FPU enabled for hard-float userspace).

See README.md inside each tarball for boot instructions (QEMU / Spike).

Linux Image, vmlinux, fw_payload (OpenSBI)

linux-6.12.57.zip
linux-6.14.2.zip